<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
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    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
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    <link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet">

</head>

<body>

    <!-- 
        container  响应式的版心   max-width:1170px
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    <header>
        <div class="container">
            <div class="page-header">
                <h1>页面标题实例
                    <small>子标题</small>
                </h1>
            </div>
        </div>
    </header>

</body>

</html>